[3365] | 1 | /*
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| 2 | * Copyright (c) 1987 Regents of the University of California.
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms are permitted
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| 6 | * provided that this notice is preserved and that due credit is given
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| 7 | * to the University of California at Berkeley. The name of the University
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| 8 | * may not be used to endorse or promote products derived from this
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| 9 | * software without specific written prior permission. This software
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| 10 | * is provided ``as is'' without express or implied warranty.
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| 11 | */
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| 12 |
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| 13 | #if defined(LIBC_SCCS) && !defined(lint)
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| 14 | static char sccsid[] = "@(#)strcasecmp.c 5.5 (Berkeley) 11/24/87";
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| 15 | #endif /* LIBC_SCCS and not lint */
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| 16 |
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| 17 | /*
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| 18 | * This array is designed for mapping upper and lower case letter
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| 19 | * together for a case independent comparison. The mappings are
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| 20 | * based upon ascii character sequences.
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| 21 | */
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| 22 | static unsigned char charmap[] = {
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| 23 | '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007',
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| 24 | '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017',
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| 25 | '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027',
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| 26 | '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037',
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| 27 | '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047',
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| 28 | '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057',
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| 29 | '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067',
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| 30 | '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077',
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| 31 | '\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
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| 32 | '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
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| 33 | '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
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| 34 | '\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137',
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| 35 | '\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
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| 36 | '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
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| 37 | '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
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| 38 | '\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177',
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| 39 | '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207',
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| 40 | '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217',
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| 41 | '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227',
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| 42 | '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237',
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| 43 | '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247',
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| 44 | '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257',
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| 45 | '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267',
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| 46 | '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277',
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| 47 | '\300', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
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| 48 | '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
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| 49 | '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
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| 50 | '\370', '\371', '\372', '\333', '\334', '\335', '\336', '\337',
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| 51 | '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
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| 52 | '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
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| 53 | '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
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| 54 | '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377',
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| 55 | };
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| 56 |
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| 57 | int
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| 58 | strcasecmp(char *s1, char *s2)
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| 59 | {
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| 60 | register unsigned char u1, u2;
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| 61 |
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| 62 | for (;;) {
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| 63 | u1 = (unsigned char) *s1++;
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| 64 | u2 = (unsigned char) *s2++;
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| 65 | if (charmap[u1] != charmap[u2]) {
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| 66 | return charmap[u1] - charmap[u2];
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| 67 | }
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| 68 | if (u1 == '\0') {
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| 69 | return 0;
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| 70 | }
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| 71 | }
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| 72 | }
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| 73 |
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